What is the meaning of "Eich Lo Uzevah"?
Rashi #1: Why was it not filled with earth around the wall to strengthen the wall? This is like "va'Ya'azu Yerushalayim Ad ha'Chomah" (Nechemyah 3:8).
Rashi #2: Why was it not released from this evil, that the evil would not come upon it?
Radak #1: Anshei Damesek, who fled, ask why the enemy did not refrain from fighting against the city and destroying it. Targum Yonasan is like this.
Radak citing Version #1 of Targum Yonasan: How was it not abandoned?
Radak citing Version #1 of Targum Yonasan: How was it not forgotten?
Radak #2: This is like "va'Ya'azu Yerushalayim" (Nechemyah 3:8), building and strengthening. I.e. why wasn't the wall built and strengthened, so the enemy could not rule over it?
Why is it written Tehilah, and we pronounce it Tehilas?
Radak: Both of them mean the same (praise). Often Tov is in place of Hei.
Why does it say "Kiryas Mesosi"?
Rashi: This is how its king will mourn over it.
Radak: The city of joy. Targum Yonasan is like this. Malbim - its men were not depressed and weak, rather, they were happy to fight. (How was it not strengthened?)